Constructing effective interview scenes, part III, in which I stop resisting the urge to nag novelists about Hollywood narration and just get on with it, already

Last time, I introduced you to that most pervasive killer of dialogue realism, Hollywood Narration, the perplexing practice wherein backstory is conveyed by dialogue between persons who both already know the information perfectly well — and thus have absolutely no legitimate reason to be having that particular conversation at all. To save you confusion in future critique groups and editorial conversations in the dim, uncertain future, I should hasten to add that the term Hollywood Narration is